Question

the length of a rectangle is 3 ft more than twice the width. the area is 90 square ft. what are the dimnesions of the rectangle.

Answer 1

width = x ; length = 2x+3ft
x(2x+3)=90
2x^2 + 3x = 90
using quadratic formula discriminant=729
x=(-3+27)/4=6ft (taking 27 +ve coz dimensions cannot be -ve)
so width = 6ft and lenght 15ft